import com.fasterxml.jackson.databind.ObjectMapper;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

class Request{
    public String username;
    public String password;
}

class Response{
    public boolean ok;
}
@WebServlet("/json")
public class JsonParameterServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//        json 格式
//          {
//              username: "zhangsan",
//              passwoed: "123"
//          }
//          把请求的 body 按照 json格式解析成 java对象
        ObjectMapper objectMapper = new ObjectMapper();
        Request request = objectMapper.readValue(req.getInputStream(), Request.class);
        System.out.println("username: "+request.username);
        System.out.println("password: "+request.password);

        Response response = new Response();
        response.ok = true;//表明请求是否成功处理
//        把响应对象转成json字符串
        String s = objectMapper.writeValueAsString(response);
        resp.setContentType("application/json; charset=utf8");
        resp.getWriter().write(s);
    }
}
